A bone plate system is provided for joining together bone parts of a surgical patient. The system includes an elongated bone plate defining a longitudinal axis and having a first portion containing a first slot; a second portion containing a second slot; and a third portion containing a threaded hole. First and second compressing screws are provided for passage through the first and second slots and engagement into first and second respective bone parts. The compressing screws are configured to forcefully interact with the slots, and to urge the bone parts towards one another. A locking screw is provided for passage through the threaded hole and engagement into a third bone part.